| Feature | Mobile Directory Catalog | Condensed Directory Catalog on server | Directory assistance for secondary IBMŸ LotusŸ DominoŸ Directory or Extended Directory Catalog | Directory assistance for remote LDAP directory |
| IBMŸ LotusŸ NotesŸ client mail addressing | Yes | Yes | Yes | Yes |
| Notes client LDAP-style searches | Yes | Yes | Yes | No |
| Notes client directory browsing | Yes | Yes | Yes | No |
| Notes client type-ahead addressing | Yes | Yes (if no Mobile Directory Catalog) | Yes (if no Mobile Directory Catalog) | No |
| Notes client F9 address resolution | Yes | Yes | Yes | No |
| LDAP client search and write operations | No | Yes (search)
No (write) | Yes | No |
| LDAP client referrals | No | No | No | Yes |
| Internet client authentication | No | Yes | Yes | Yes |
| Group authorization (enabled for one secondary directory only) | No | No | Yes | Yes |